Edited original post: for what started out as an issue being able to access files on an external drive on my IPP, which I assumed was a power requirement turned out to be nothing more than reformatting my external to APFS. It works beautifully now with my 2018 IPP 12.9. That drive was previously formatted to use with Time Machine on my Mac Mini as MacOS Extended (Journaled), and although I could see the folders, I couldn't get access and the drive/Files app would quit.
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